From: Thien-Thi Nguyen <ttn@gnuvola.org>
To: tomas@tuxteam.de
Cc: emacs-devel@gnu.org
Subject: Re: [PATCH] use tail pointer for LOOP
Date: Thu, 17 Jun 2010 12:12:43 +0200 [thread overview]
Message-ID: <87eig655no.fsf@ambire.localdomain> (raw)
In-Reply-To: <20100617092232.GA27846@tomas> (tomas@tuxteam.de's message of "Thu, 17 Jun 2010 11:22:32 +0200")
() tomas@tuxteam.de
() Thu, 17 Jun 2010 11:22:32 +0200
Oops, i didn't look at this carefully before:
(defun do-benchmark (n)
(let ((lst))
(while (> n 0)
(setq lst (cons n lst)
n (1- n)))
(garbage-collect)
(message (concat "copy1: %S\n"
"copy2: %S\n"
"copy3: %S\n")
(benchmark-run (copy1 lst))
(benchmark-run (copy2 lst))
(benchmark-run (copy3 lst)))))
Probably for more meaningful results, you should ‘garbage-collect’
prior to each ‘benchmark-run’. Otherwise, each run is disadvantaged
(less memory "easily" available) with respect to its predecessor.
A standard benchmarking principle (useful in other disciplines, too)
is to eliminate these differences.
thi
next prev parent reply other threads:[~2010-06-17 10:12 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-05-29 21:56 O(N^2) behavior in LOOP Daniel Colascione
2010-05-29 22:06 ` Daniel Colascione
2010-05-29 22:14 ` Lennart Borgman
2010-05-29 22:35 ` Geoff Gole
2010-05-29 23:58 ` [PATCH] use tail pointer for LOOP (Was: Re: O(N^2) behavior in LOOP) Daniel Colascione
2010-05-30 0:45 ` Ken Raeburn
2010-05-30 0:49 ` Daniel Colascione
2010-06-16 17:44 ` tomas
2010-06-16 18:10 ` [PATCH] use tail pointer for LOOP David Kastrup
2010-06-17 5:10 ` tomas
2010-06-17 7:18 ` Thien-Thi Nguyen
2010-06-17 9:22 ` tomas
2010-06-17 10:03 ` Thien-Thi Nguyen
2010-06-17 14:05 ` tomas
2010-06-17 15:16 ` Thien-Thi Nguyen
2010-06-17 10:12 ` Thien-Thi Nguyen [this message]
2010-06-17 20:48 ` Stefan Monnier
2010-06-18 7:07 ` David Kastrup
2010-06-18 13:40 ` Stefan Monnier
2010-05-30 17:05 ` Štěpán Němec
2010-05-30 17:09 ` Daniel Colascione
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